Grinder



w. F. FRASER.

GRINDER. V APPLICAUON FIIED MAY8,1920. l 1,42%398., Patented Aug. 1, 1922.

3 SHEETSSHEET I.

5 I" Wag/WM Mg/g# w. F. FRASER.

GRNDEH.

APPLICATION FILED MAY 8, 1920. 1,424,3Q8, Patntefl Aug. 1, 1922 3 SHEETSSHEET 2.

W. F. FRASER.

GRINDER.

APPLICATlON FILED MAY 8, 1920. 1,424,398. Patented Aug. 1,1922.

r )FZ 54 3 ETs--SHET 3.

UNIT

ferrie 1:;

WARREN FJFRASER, OF WESTBORG, MASSACHUSETTS.

GRINDER.

Appncauon eia nay a, 1920. sei-'iai no. 379,343.

` oi said operator tree to be used solely iter inserting' and removing the work.

lt is also an object oit the invention tor provide a novel meeliai'iism" tor' causing the head-stock and tail-stoel; to grip andrelease the work siniultaneously with the operation of zt toot treadle which controls the rotation ot the head-steelt spindle, the downward movement of said -toot treadle successively" disconnecting said spindle 'from its driving instrumentalitiem then causing' the'chuclr to release the work held thereby, and iinally withdrawing the tail-stock centering pin in order that tliework may be removed, the upward movement olv the treadle causing a reversal oit said operations when the iootis removed from said treadle.

lt is also an object oit the invention to provide in conjunction with a toot treadle for operating a clutch mechanism to throw into operation the grinding wheel 'feeding mechanisnnmeans for automatically locking said clutchl in engagement with the drivii instrumentalitiee, and also meansV to automatic-ally disconnect Said driving instru#` inentalities at the completion of the grindingwoperation: I l i Linother ob]ect ot the invention is to elim inate the results ci' inaccuracies and lost motion which may occur in the grinding wheel feeding mechanism, and by so .doing increase the accuracy and efficiency of the grinder. i

Still another object ot the invention is to Specification of Letters Patent.

Patented Anw. i, 1922.

provide grinding wheel dressing instrumentalities which are movable with the grinding' wheel and also i adjustable relatively' thereto.

The invention consists in the combination and arrangement of parts whereby the above objects and certainother objects hereinafter appearing may 'be attained as set forth4 in the followingspecification,` and particuthere`o`. Y l 60 larly pointed `out in the claims Referring tothe drawings: f

Figure l represents a 'front elevationjof a grinder einbodyingrm'yinvention;

Figure :2 is a vertical section taken on line 2-2 oi Figure l las viewed from the riO'ht in said figure. i

*igure 3 is a plan viewofthey head-stock mechanism, a portion of the saine being illustrated in horizontal section taken upon the line 3-3 of Figure l.

` ligure a is a vertical longitudinal sectiony through the tail-stock.

Lilie numerals refer to like parts throughout the several views or' the drawings;

In the drawings, l() represents the main 'trame oit the machine provided with a bedplate l1. upon which are mounted a headstocl; i2 and a tail-stoel( i135 each being ad-` justable longitudinally otsaid bed-plate and securely clampedl `thereto at any `desired. location thereon. A grinding wheel la is rotatably mounted in t'aine l5 `which is secured to a carriage Il'adapted to reciprocate transversely ot the bed-plate 1l upon another bed-plate 1'( also forming a part of the :trame l0. A driviiig shaft `i8 is jour nailed to rotate in suitable bearings provided upon the frame l0 andV is driven'` by a pulley 19 from any suitable Source or" power.` A cone pulley 2O is tast to the driving shaft i8 and is adapted to drive by means of a belt 2l a cone pulley 22 which ie loosely mounted upon arcounter-shatt 23 journalled to rotate in bearings provided upon the trame l0 and in abraclret 2t, the` said. bracket being supported upon said trame. A pulley 25 is secured to and adapted to rotate with thevcone pulley 22 and is connected by a cross belt 26 with an elongattov leasedby the head-stock 12 and tail-stock 13 ed pulley 27 which is fast to Va shaft 28 mounted to rotate in bearings 29 and 30 provided in a frame 31 forming a part of the head-stock 12, see Figure 3.

A clutch member32 provided with teeth 33 is fast to the shaft 28 and is also adapted to slide longitudinallyon said shaft in order that the teeth 33 may engageteeth 34 `of a. clutch member 35 which is formed integral with aspur gear 36 looselymounted upon a reduced portion of the shaft 28.

gear 36 meshes with and drives a spur gearv The spur 37 fast to a spindle 38 journalled to rotate in bearings 39 and 40 which are supported in-the `head-stock frame 31. The spindle 38 constitutesv the driving memberlof the headstock 12 and is driven continuously except when the clutch member 32 is disengaged fromtheclutch member 35 which is accomplished in the following manner: i

Pivotally'mounted upon a stud 41 projecting, from the frame 1Q- isa foot'treadle 42 which is normally heldin its uppermost'positionas illustrated in Figures land 2, by a spring 43. Thefoot treadle 42 is connected by a rod 44 with a cam lever` 45 which is pivotally mounted yupon a stud 46 fast to` the head-stock frame 31.` The cam lever45 is provided with a Acam surface 47 which engages a roll 48 carried by al lever 49 fast toa shaft 50 mounted to rock in bearings l51 and 52, also provided in the head-stock framef31. Fast lto therock-shaft 5() isla clutch shifting arm 53 the upper end of which is forkedand provided with rolls 54 which are adapted to engage the sides of an annular., groove 55 provided in the; clutch membery32. Al spring 56 encircles the rockshaft 5,0, one end of said spring being fast to said shaft and the other end` fast tothe head-stock frame 31, Vand always acts to `forcethe clutch member32 linto engagement withv the clutchV member 35.

` 'By placing a foot upon the .treadle 42 the cam lever 45 is rocked upon the stud 46 and the cam surface 47 `will cause the lever 49 to rock the shaft 50 thereby rocking the shifting arm 53 and forcing the teeth33 of the clutch member-'32 out of engagement with theteeth 34 oftheclutch member 35. This will `disconnect the spindle 38 from its driving instrumentalities whereupon it will immediately cease to rotate and will remain stationary until' the foot is again removed from the treadle 42. i

As previously stated, one of the novel features of this invention is the mechanism whereby the work may be gripped and resimultaneously with the operation of the foot treadle 42. By referring to Figure 3,

so much of this mechanism as is related to thehead-stock12 is as follows:

The spindle 38 is provided with a bore 57 which extends longitudinally therethrough therein. y

The chuck 58 is adapted to slide-longitudivnally within the spindle 38 and also 'to rotate therewith, a pin 63 being provided in the spindle 38 which projects into a longitudinal groove 64 in said` chuck. The inner end of the chuck 58 is screw threaded at 65` and hasV attached thereto a rod 66 which extends through the spindle 38 upon the axis thereof, projecting beyond the rear end of said spindle and terminating with a hexagonal` portion y67 at its extreme outer end.`

Fast to the rear end of the spindle 38is a collar 68, and'inounted upon the vrod 66 near the rear ,end thereof is a similar collar 69. A pair of rods 7 (l extend between the collars 68 and 69 being securely fastened to each i and thereby positioning the collar 69 relatively-tothe rear end of the spindle 38.

The rod66 is provided with anenlarged por-4 tion 71 which is `forced against the collar 69 if there is no workin the chuck 58, by a spring 72 whichv encircl'es the rod 66, op-

posite ends thereof bearing against .thead-` jacent Lfaces of the enlargedy portion 71 and collar 68, being compressed therebetween. rIhe normal tendency of the spring 72 therefore, is toforce the enlarged taperedend 59 of the chuck. 58 inwardly against the tapered opening 60 at the end of the spindle 38 and thereby cause the chuck 58 to grip the work Awhich is `located .within the recess 61.

If there is no work in the chuckthe collar 69 constitutes a stop to prevent the spring 72 Y from forcing the outer endof the chuck too far into the opening 60and thereby tending toV bend the gripping portions .ofthe chuck. A screw 711 located in ther collar 6.9 project-s into one of a plurality of slots 712 formed in the periphery of the member 71 thereby locking-the rod 66 tothe collar 69. As the spindle 38 rotates, the chuck 58, rod 66, collars 68 and V69', rods 70 and vspring 72 will all rotate simultaneously therewith.

The spindle 3.8 is prevented from moving longitudinally within the bearings 39 and 40 byV a cap 73 which` has screw threaded engagement with a boss 74 formed integral with.:l the head-stock frame 31 and bears against aflange 75 formed integralwith the spindle 38, the said flange rotating between said cap 73 and a ring 76 which is inserted i in an annular recess provided therefor in the boss 74 adjacent to the outer end of the bearing 40. r1`he spring chuck 58 may vet upon the bed-plate inaalgeee be removed from the spindle 138 by removing the screw 711 and then` turning the rod G6 thereby forcing the chuck 58 outwardly.

The cam lever 45 isy provided with a cam surface T7 which engages a cam roll 7 8 carried by a lever 79 mounted to rock upon a shaft 80, supported in suitable bearings 81 and 82 provided in the head-stock frame 31. ein arm 83 formed integral with the lever 79 has adjustably fastened therein a stud 84v the end of the rod 66 also acts to stop theV momentum of the spindle 38.. Upon removing `the foot from the treadle 42 the spring '72wi'll` again cause' the chuclr to grip the work and force the lever 'T9 baclr to its original: position. f i

A stop pin 85 projecting from the headstock frame 31 is located in a position to be engaged by the cam lever V45 and thereby limit the upward movement of the foot treadle 42. The' lread'stoclr frame 31,` together `with all the parts mounted thereon may be located at any position desired 11, being fastened thereto by `a clamp rod 86, the lower end of which is located in groove 87 which eX- tends longitudinally inthe bed-plate 11 and engages a liange formed integral with "said bed-plate as illustrated in Figure 2.

Simultaneously with the operation of the foot treadle 42and during` the latter part vof the downward movement thereof, the

tail-stock mechanism 13 is also caused to be operated te withdraw the centering" pin thereof in order that the work may be removed from. between the head-stock and tail-stock. `Referring particularly to Fig-L ures 1, 3 and 4, an arm 88 is loosely mounted upon the stud 46 andhas 'a pin 89 projecting forwardly therefrom which is adapted to be engagedby kan upper edge 90 ofthe.

cam lever 45 during the latter part of the movement thereof. The arm 88 is connected by a rod 91 with an `arm 92 to which it is clamped, the arm 92,in turn,y being fast to a shaft 98 mounted to'rock iny a frame 94 forming a part of the tail-stock 18. A'spur gear 95 is fast tothe rock-shaft 93 andis located within the recess 961 formed in the tail-stock frame 9.4. The gear95 meshes with a rack 97 formed upon a sleeve 98, the axis of which is in longitudinal alignment with the axis of the spindle 38 of the headstoeln 12; A centering pin 99 is secured in `theend ofthe sleeve 98 adjacent to the headsto'clr 12, the said pin cooperating with the chuck 58 in supporting the worlr which is located therebetween. The' end ofthe sleeve 98, in which the centering pin 99 is located, projects through the frame 94 and has a cap 100 fast thereto, a portion thereof surrounding a boss which is formed integral with the tail-stoel; frame 94. The sleeve 98 is adapted to slide longitudinally within a bore 101. A spring 102 is locatedy within the bore 101, one end of said spring bearing against the sleeve 98 and the other end :against an adjusting screw 108 which has screw threaded,engagement with a plugv 104 located at the rear end of the tail` stock frame 94. rlhe screw 103isv adapted to regulate the tension of the spring 102 and when properly adjusted is secured in position' by a loclr nut 105.` i

A. handle 106 is formed integral with the arm 92 in order thatthe tail-stock mechanism may be operated independently of the loot treadle 42 if it is so desired. The tailstoclrl may be located at any position desired. upon the bed-plate 11, being fastened thereto by a clamp rod 107v in a `manner similar to that employed in fastening" the head-stock 12 previously described. ln Figure 1 the tail-stock has been moved toward the end of the bed-plate 11 in order to more clearly illustratethe grinding instrumentalities which would otherwise be partially ob scured.

During the latter part ofthe downward movement o'l' the foot treadle 42, the upper edge 90 of the cam levere will engage the pin 89, thereiiy rocking the arm 88 and transmitting` `through the rod 91 rockingl movement to the arm 92 which being fast. to the shaft 93 will rock said shaft and spur gear 95 thereby moving thesleeve 98` and centering pin 99 toward the right,` in Figures, l. and 4 against the tension of the spring102. This will release 'the centering pin 99 from engagement with the work which can then ido be removed and replaced by other work. i

Upon again releasing the foot treadle 42, the spring 102 will `immediately force the centering pin toward the left and onceimore into yielding engagement with the w'orlr which is thereafter grippedby the chuck and the spindle again rotated as previously described.

The mechanism forcontrolling andoperating the grindinginstrumentalities is as follows: Pivotally mounted upon the' stud 41 adjacent to the `foot treadle 42, is a second yfoot treadle 108 whichis connected by Aa rod 109 with a horizontally disposed lever 110 fast to a shaft 111 mountedy to rock in suitable bearings in thebraclret 24. Also fast to the shaft .111`is a shifting arm 112 which is adapted to operate a movable clutch member 118 fast to thecountershaft and force. .said `clutch member into engagement with alsecond clutch `member 114, thereby lcausing thefcounter-shaft 23 to rotate with the cone pulley 22. Fast to the. counter shaft. 23'` atthe outer end thereof is a brakedrum1`15. A lever116 is pivoted at 117 to the `:bracket 24,V oneend `of said lever being connected by a linlr 118 tothe lever 110 and the other end of said` lever having a screw 1F19'm`ounted therein which isadapted to en- 1 gage the loweiendof a friction member' 120 slidablylimounted in. a vertical position in c end ofthe leverllO. from that to which the thebraclet 24, and force said friction membei? against the brake-drum 115 at such times as the .counter-shaft 23 is disengaged from the vcone pulley 22.. Fastin thencpposite rod 1091s connected, is a pin 121, the upper Side of said pin being semi-cylindrical and the under side being flattened. he pin 121 isi-adapted to engage an oppositely disposed correspondingly shapedpin 122, "the upper side being flattened and the under side be.-

ing semi-cylindrical7 said pin `being fast to the lower-end of a vertically,disposed lever V .1231,whichyis` `pivotedupon a stud 124 pro- Y jecting fromabracket 125attached to the front ofthefframelld A: spring v126, `one Y I endof which is attached totheiifrarne 10 and the other end attached to the long arm ofthev lever 110, always -actsgte pull said long arm :downwardly and cause the-flaty ltened, surface of the pin `121 tov engage the flattened surface of the pinf122, thereby` :3.5V

holding the clutch member 113 in clutching ,engagement` with the clutch member 114 and also holding the friction member 120 out rif-engagement with the brake, drum 115.

' `ylFast tothe counter-shaft23 `and rotatable therewithis a worm127 which is adapted to driveawormrgear 123 fast to a shaft 129 mounted y"to rotate in bearingsf130 and 131 provided upontheframel() Vand the bracket 125 respectively. cylindricaly cam 132 provided with acam surface` 133.. A pin 134 is located in the front faceof the cam 1327 said pin being adapted to engage at the proper time a roll 135 attached to theleverv 123 and force the upper `end lof said `lever toward the right, Figure 1, against the action of a spring 136. This movement of the lever 123 will move the pin 121 attached atthe lower end thereof, 'out of engagement with the pin 122 thereby allowing the spring 126to disengage the c-lutchmember 113 from the clutch niember 114 and at the same .time cause the frictionvmember 120 to engage the brake drum 115thereby preventing` further rotatien of the counter-shaft At the upper end of the lever 123 is located'a suitable handle 137' which may be utilized for manually disconnecting the counter-shaft 23 from its driving nstrumentalities.l A stop pin 138` projecting from the bracket-,125 limitsithe movevproper time. i

Fast tothe shaft 129 isa ment of the'upperend of the lever 123 towardsaid bracket and positions the lower end of said. lever in orderl that the pins 121l and 1221nay ,engage each other at the Pivoted to the bracket `at 139 is a lever 1,40 the` lower end of which has a cam roll l141 attached thereto, which is adapted to `engage the working-camsurface 133 of the upon the carriage 16. They grinding wheel 14 is attached to a shaft 146 which is adapted to rotate in bearings147 providedv therefor upon the-framev 15 and is driven continuously at a high rate of speed by apulley 148y attachedto the main driving shaft 20 through the medium of a vbelt 149 which extends aroundv a pulley 15()V attached to the shaft 146.` y i lin ordertocompensate forthe varying distance 4between the centers 'of the shafts' 2O and- 146 during the reciprocatory move- 'ment ofthe carriage 16, a belt tightening device is provided which consists of a bellcranla:v lever 151 which ispivoted upon a stud 152 projecting from the side of the armlfO. vAn arm 153 of the bell-crank lever 151-has `an idler pulley 154 rotatably mount-` ed'thereon, 'while another arm 155 of the bell-crank leverl 151 has a weight-156 attached thereto which is adapted to; always `force the idler pulley 154 against the belt 149 thereby causingl i said.v belt to properly grip the pulleys 148 and 150.

-lfi'henf the work is properly secured between the head-stock 12"and` tail-stock 13, as previously described, and readyfor the grinding operation, a foot is placed upon the foot treadle `108 forcing thesame downwardly thereby simultaneously releasingl the bra-ke drum 115 and forcing the clutch mem.- ber -113 `into engagement with the clutch member 114 thereby causing the countershaft 23 to rotate. As Vthe long arm of the lever `110nioves upwardly the semi-cylin- ,drical upper sideofithe pin 121 will engage the rounded Ilower side of the pin 122,

causing the lower end of the lever 123150 roclrslightly and allow the, pin 121 to pass the pin L122 after which the spring 136 will ypull the`lever=123 back into its normal position and the saidy pins will align with each other, the flattened faces thereof vbeing` in engagement with each other. This will pre-` vent thespring 126V from rockingv thelever ilo 110 and disconnecting vthe countershaft 23 from its driving instrumentalities When the foot isV removed from the treadle 128. The rotatiOjIl of the counter-shaft 23 with the Worm 127 fast thereto will drive the vvorm gear 129 and thereby rotate the cylindrical cam 132, the Working cam surface 133 of which contacting with the cam roll 141 will rock the lever 140 upon its pivot 139 and move the carriage 16 toward the left, Figure 2,5thereby movinnf the grinding VWheel 11i into engagement with the work. During; this time the grinding Wheel 141 isbeing rotated continuously at a rapid rate of speed by the belt 149 from the pulley 141-8 fast to the main driving shaft/20. The carriage 16 with the grinding instrumentalities carried thereby are fed quickly toward the Work duringthe initial movement of the cylindrical cam but during the greater portion `of. the rotation of said cam, or during the ractual grinding period the carriage 16 moves very slowly and is no t moved rearwardly until Athe cam has nearly completed one revolution7 when a cam surface 1331 will engage the roll 14:1 .as illustrated in Figure 2 thereby returningrthe carriageV 16 to its initial position. Just prior to the completion ofthe rotation of the cam 1327 the pin 134.- carried thereby will engage the roll 135 which is attached to the`lever 123 forcing` Xthe upper end of said lever toward the right, in Figure 1f, and rocking the lower end Aof said lever a suiicient distance to dis engage the pin 122 from the pin 121, Whereupon the sprintf 126 will automatically cause the lever 110 to rock and simul.ti ineously .disengage the countershaft from its driving instrumentalities and cause the friction member 120 to grip the brake drum 116. This will prevent further rotation of the cam 132 and cause the carriage 16 to come to a rest at its extreme rearward position.

The carriage 16 is aluf'ays fed the same distance by the cam 132 irrespective of the diameter of ythe uork upon which the grindingr operation is performed. lt is, therefore. necessary when chancjinfr the dia-meter of either the Work or the ,grinding Wheel 14:. to"`a liust the location of the frame 15 upon the Acarriage 16 in `order that When the grindinfr Wheel has been fed into engagement `with the Work and the grinding operation has been completed that the Work Will have been accurately lrjround to the required diameter. The means for accomplishing this adjustment is as follows: Fast to the `front of the frame 15 is a bracket 157 in which is rotatably mounted an adiustinra scren'f the rear end of -which li screw threaded 4en- `.rap'ement with the carr ge 16. Fast to `the front end of the adjustinn` screw is a hand Wheel 159 upon the periphery of v, ich are suitable Igraduations' 160 ivhh .Y ,TSSBIIC preferably in thousandths of an :ich the an adjustable stop is provided to limit the J forward movement of the carriage 1 6. Fast to the rear of the frame 10 is `a vbracket 162 and projecting, rearwardly from the carriage 16 and passing `through an opening" in "the bracket '162 is a rod 163. A thumb nut 161i has screw threaded engagement with the rod 163 and is adapted to abut against the bracket 162. `Thetliumb nut is provided with, suitable graduations 165 which `extend i around the hub portion thereof and register with a suitablejmark upon the bracketl 162, graduations 165 also represent in thousandths of an inchthe movement of the carrige 16. 'A loc-lr nut 166 also v has screw threaded engagement with the ro`d-r163 and is attached to the thumb nut 164 by screws 167 being rotatable with said thumb nut. ln locating; the thumb nut 164i upon the 4rod 1 63 the said nut is so positioned thatduring the forward movement of the carriage 16, the nut V164i Will `abut against the bracket 162 about ".002 in ladvance of the kactual for- ".vard position of the carriage, the leverv 14() yielding enough to offset the distance lacking. The arrangement of the thiunb nut 164 and lock nut 166 also eliminates any lost motion. therebetween when the screws 16T are tiuhtr-ined to clamp said nuts upon 4the scren`r thread toHi'nfevent rotation thereof.

,is preriously stated one of the objects of the inveiition is to provide grinding Wheel dressing^` instrumentalities which ivill be movable with rthe grinding Wheelill and also adjustable relatively thereto. This device is constructed as follows: Mounted upon the grii ding Wheel frame l5 is a bracket 168 which is provided with vertical Ways 169 upon which a slide i170 "is mounted and adapted to be fed vertically by la feed screw 171. Fast to the upper vend ,of the feed screvzT is a hand Wheel 172 by Which said screw is rota-ted, and also attached to the feed screw is a disc '173 upon the periphery ofl` which are graduations 171i which are adapt ed to register with a mark upon a finger 1175. The graduitons 174 represent y in thousandths of an inch the movement of the slide 170, Fast to the slide 170 is a cylinder 176 in which a tool holding member 177 is adapted tobe moved longitudinally by a feedscreiv 178 -ivhi h is rotatlbly mounted `in a bearing 179 "located at ione enfd of said cylinder, said ies iso

head-stock'and a tail-stock adapted'tc support and grip work therebetween, means to rotate said work, a grinding wheel, a carriage Aupon whichsaid grinding wheel is mounted, a cam adapted to impart a reciprocatory motionl to said carriage, `means to rotate said cam, means to4 automatically prevent the rotation of said cam at the completion of the grinding operation, a foot treadle, and means operated .by said foot treadle adapted to successively stop the rotation of `said work, cause said head-stock to release said work and remove said tail-stock from engagement with said work.

13. Agrinderhaving, in combination, a head-stock and a tail-stock adapted to support and gripv work therebetween, means to rotatewsaid'work, a grinding wheel, a carriage uponwhich said grinding wheel is mounted,-a cam, means to rotate said cam, means connecting said cam and said carriage adapted to impart va reciprocatory movement to said carriage, means to positively limit said movement to the extent of springing the .means by which said movement isaccomplished, means to automatically prevent the rotation of said cam at they completion 'of the grinding operation, afoot treadle, and means operated by saidy footftreadle adapted to successively stop the rotation of said work, cause said head-stock to release said work and remove said tail- 5 stock from engagement with said workL 14:. A` grinder having, in combination, a head-stock and a tail-stock adapted to support and grip work therebetween, means to rotate said work, a grinding wheehacarriage upon which said grinding wheel is mounted, la cam adapted to imparta reciprocatory motion to said carriage, means `to rotatev said cam embodying therein driv-l ing `instrumentalities land a clutch `mecha- Ynism,` afoot treadle, `and means connected Vwith said foot treadle adapted to lock said clutch `in* engagement with said driving inistrumentalities. i

15u/A grinder' having, in combination, a

head-stock and a tail-stock adapted to support and grip/ work therebetween, means to rotate. said work, a grinding wheel, a carriage upon whichfsaid vgrinding wheel is mounted, a camadapted to impart a reciproeatory motion to said carriage, means to rotate said cam embodying therein driving `instrumentalities yand va clutch mechanism, ya foot treadle, means connected with said foot treadle adapted to lock saidclutch mechanism in engagement with said driving instrumentalities, and means to ,automati- Vcally disconnectsaid clutch mechanism from said driving instrumentalities at thecompletion of the grinding operation.

`v16. Al grinder having, in combinationra i head-stock and a tail-stock adapted to Vsupport and grip work therebetween, means 'to rotate said work, a grinding wheel, acai'- riage yupon which saidl grinding wheel is mounted, a cam adapted to impartafre ciprocatory motion to said carriage,]niean`S to rotate said cam embodying therein driving instrumentalities and a clutch mechanism, a pair of foot treadles, means -coninected with oneof said foot treadles adapted` l* to lock said clutch mechanism in engagement with said driving instrumentalities",

and means connected with the other of said nected to one of saidfoot treadles adapted toV lock said clutch mechanism in engagement with said driving instrumentalities, and means-connected 'to` the other of said foot treadles adapted to successively prevent the rotation of said work, ungrip oney end of saidl work, and remove the support from the other end of said work. j l

, V18. A grindervhaving, in combination, a head-stock and a tail-stock -adapted to support and gripjwork therebetween,`means to rotate said work, Va grinding wheel, a lcai'-A riage upon which said grinding wheel is mounted, a cam adapted to impart a reciprocatory motion to said carriage, means tolrotate said cam embodying therein driving 4iiistrumentalities. and a clutch mechanism, a

pair of `toot ltreadles, means connected to one ofsaid. foot treadles adapted to lock ysaid clutch mechanism in engagement with said driving instruinentalities, means to automatically disconnect said clutch mechanism means connected to the other of saidfoot treadles adapted to su'ccess'ivelyprevent the rotation of said work iingrip one end of said v from said driving instrumentalities at the completion of the grinding operation, and

work and remove thesupport from the other end of said work. c y 4 19. A ,grinder havingdincembination, a head-stock and atail-stock adapted to support and grip work therebetween, means to rotate said work, a grinding wheel, means to rotate vsaid Agrindinglwheel,` a carriage, Aa

frame upon said carriag'ein which said grinding wheel'is rotatably mounted, means to move said iframev relatively tofsaidcartory motion to said carriage, means to rotate said cam embodying therein' driving'instrumentalities and al clutch mechanism," afpair of foot treadles, means connected to oneof riage, a cam adapted to impart a reciprocaiaaaea said Yt'oot treadles adapted to lock said clutch mechanism in engagement with said driving instrumentalities, means to automatically disconnect said clutch mechanism from said driving instrumentalities at the completion oi: the grinding operation, and means connected to the other ot .said 'toot treadles adapted to successively prevent the rotation of said Work, ungrip one end of said Work and remove the support from the other end of said norlr.

20. A grinder having, in combination, a head-stock and a tail-stoel; adapted to support and grip Worlr therebetween, means to rotate said Work, a grinding Wheel, means to rotate said grinding Wheel, a carriage, a trame upon said carriage in which said grinding Wheel is rotatablymounted, means to move said frame relatively to said carriage, a cam adapted to impart a reciprocatory motion to said carriage, means to rotate said cam embodying therein a counter-shaft, driving instrumentalities loosely mounted upon said counter-shalt, a brake drum fast to said counter-shaft and a clutch mechanism; a friction member', a pair ot foot treadles, means connected to one o:t` said foot treadles adapted to lock said clutch mechanism in engagement with said driving instrumentalities, means to automatically disconnect said clutch mechanism from said driving instrumentalities and apply said friction member to said brake drum at the completion or' the grinding operation, and means connected to the other of said loot treadles adapted to successively prevent the rotation of said Work, ungrip one end of said Work and remove the support from the other end of said Work.

2l. A grinder having, in combination, a head-stock and a tail-stock adapted to support and grip Work therebetween, means to rotate said. Work, a grinding Wheel, means to rotate said grinding Wheel, a carriage, a iframe upon said carriage in which. said grinding Wheel is rotatably mounted, means to move said trame relatively to said carlri age, a cam adapted to impart a reciprocatory motion to said carriage, means to rotate said cam embodying therein a counter-shaft, driving instrumentalities loosely mounted upon said counter-shaft, a brake drum tast to said counter-shalt and a clutch mechanism; a friction member, a rock-shaft, a horizontally disposed lever attached to said rock-shaft, a sliiitinfr arm also attached to said rock-shalt, a vertically disposed lever, a pair of foot treadles one of which is connected to said horizontal lever and adapted to force said horizontal lever into locking engagementwith said vertical lever and thereby hold said clutch mechanism in engagement with said driving instruinentalities, means to disconnect said levers and thereby automatically disconnect said clutch mechanism from said driving instrumentalities, and means connected to the other of said 'foot treadles adapted to successively prevent the rotation of said Work, ungrip one end oit said work and remove the supportfrom the other end olt said work.

A grmler having, in combination, a head-stock and a tail-stock adapted to support and grip Work therebetween, meansto rotate said Work, a grinding Wheel, means to rotate said. grinding wheel, a carriage, a irame upon said carriage in which said grinding Wheel is rotatably mounted, means to move said frame relatively to said carriage, a cam adapted to impart a reciprocatory motion to said carriage, means to rotate said cam embodying therein a eountershai't, driving instrumentalities loosely mounted upon said counter-shaft, a brake drum fast to said counter-shaft and a clutch mechanism; a friction member, a rock-shaft, a horizontally disposed lever attached to said rock-shaft, a shitting arm also` attached to said rock-shaft, a vertically disposed lever, a pair of foot treadles one ci which is connected to said horizontal lever and adapted to torce said horizontal lever into locking engagement with said vertical lever and thereby hold said clutch mechanism in engagement with said driving instrinnentalities, means to connect said friction member with said horizontally disposed lever, means to disconnect said horizontal and vertical levers and thereby automatically disconnect said, clutch mechanism from. said driving instrumentalities and also force said friction member against said brake drum, and means connected to the other oi said toot treadles adapted tosuccessively prevent the rotation of said Work, ungrip one end ot said Work and remove the support from the other end of said vvorlr.

A grinder having, in combination, a head-stock and a tail-stoel; adapted to support and grip Work therebetween, means to rotate said work, a grinding Wheel, means to rotate said grinding Wheel, a carriage, a Vtrame upon said carriage in which said grinding wheel is rotatably mounted, means to .move said. frame relatively to said carriage, a cam adapted to impart a reciprocatory motion to said carriage, means to rotate said cam embodying therein a countershaft, driving instrumentalities loosely mounted upon said counter-shaft, a brake drum fast to said counter-shaft and a clutch mechanism; a friction member, a rock-shaft, a horizontally disposed lever' attached to said rock-shaft, a shitting arm also attached to said rock-shaft, a pin located at one end ot said horizontal lever, a vertically disposed lever, a pin located at the lower end oi. said vertically disposed lever, a pair of foot treadles, one of which is connected to from said driving instrumentalities Vand alsoforce said friction member against said brake drum, and means connected to the other of said foot treadles adapted to suc-l cessively prevent the rotation of said Work, ungrip one end of said Work and remove the support from the other end of said Work.

'24. A grinder having, in combination, means to grip and support the Work at one end thereof, means to rotate said Work, au

grinding Wheel, means to feed said grnding Wheel into engagement with said Work, a manually operable member and means connected to said manually operable member adapted to successively prevent the rotation of said work and release the Work from operative engagementA With its supt port. Y i

In testimony whereof I have hereunto set my hand in presence of tWo subscribing Witnesses. l c

' WARREN F. FRASER.. WVitnesses:

FRANKLIN' E. Low, HERMAN R, HOFFMAN. 

